Waterproof packable fabric fully seam sealed Emblazoned with high visibility reflective safety chevrons Removable Luminite LED light unit for additional security Elasticated edge to accommodate size & shape of backpack Elastic straps & multiple stud positions to fit all backpacks Fits 15-30L backpack, Waterproof packable fabric fully seam sealed, Emblazoned with high visibility reflective safety chevrons, Removable Luminite LED light unit for additional security, Elasticated edge to accommodate size & shape of backpack